/// <summary>
/// Gets the entity with the provided primary key, or if <paramref name="throwIfNotFound"/> is true then it throws <see cref="EntityNotFoundByPkException"/>, otherwise (if it's false) returns null
/// </summary>
/// <typeparam name="TPrimaryKey">The type of primary key</typeparam>
/// <typeparam name="TEntity">The type of entity</typeparam>
/// <param name="repo">The entity repo</param>
/// <param name="pk">The primary key</param>
/// <param name="throwIfNotFound">True to throw <see cref="EntityNotFoundByPkException"/>, false to return null if the entity with the provided primary key not found</param>
/// <exception cref="EntityNotFoundByPkException">Thrown when <paramref name="throwIfNotFound"/> is true and the entity with the provided primary key not found</exception>
/// <returns>The entity with the provided primary key or null</returns>
public static TEntity GetByPk <TPrimaryKey, TEntity>(this IEntityQueryByPk <TPrimaryKey, TEntity> repo, TPrimaryKey pk, bool throwIfNotFound)
where TEntity : IReadOnlyPkHolder <TPrimaryKey>
{
if (repo == null)
{
throw new ArgumentNullException(nameof(repo));
}
TEntity entity;
repo.TryGetByPk(pk, out entity);
if (throwIfNotFound && (entity == null))
{
throw EntityNotFoundByPkException.New <TPrimaryKey, TEntity>(pk);
}
return(entity);
}
/// <summary>
/// Gets the type of the primary key of the entities
/// </summary>
/// <typeparam name="TPrimaryKey">The type of primary key</typeparam>
/// <typeparam name="TEntity">The type of entity</typeparam>
/// <param name="repo">The entity repo</param>
/// <returns>Returns the type of the primary key.</returns>
public static Type GetPkType <TPrimaryKey, TEntity>(this IEntityQueryByPk <TPrimaryKey, TEntity> repo)
where TEntity : IReadOnlyPkHolder <TPrimaryKey>
{
return(typeof(TPrimaryKey));
}
